52 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 146. 
274 Knowlton (F. II.) Eeport on a small collection of fossil plants 
from Old Port Caddo landing, on Little Cypress Bayou, 
Harrison County, Tex., made by Mr. T. Way land Vaughan. 
Am. Geol., vol. xvi, pp. 308-309. 
Gives a list of the species determined and states briefly their relation 
to the flora of the so-called eo-lignitic beds. 
275 Description of a new problematical plant from the Lower Cre- 
taceous of Arkansas. 
Torrey Bot. Club, Bull., vol. xxii, pp. 387-390. 
Describes and figures Paleohillia arkansana n. gen. et sp. 
27G Kummel (Henry B.). Some meandering rivers of Wisconsin. 
Science, new ser., vol. i, pp. 714-716. 
Describes the geologic and physiographic features of Lafayette and 
Grant counties and their effect on the drainage systems of the region. 
277 Review of " Reconstruction of the Antillean continent," by 
J. W. Spencer. 
Jour, of Geol., vol. iii, pp. 364-368. 
278 Salisbury (R. D.) and. Lake Passaic — an extinct glacial lake. 
Jour, of Geol., vol. iii, pp. 533-560. 
See Salisbury (R. D.) and Kummel (H. B.) ; No. 414. 
279 Kunz (George Frederick). Precious stones. 
U. S. Geol. Surv., 16th Ann. Rept., part iv, pp. 595-605. 
Notes on the occurrence of diamonds in Wisconsin and California, 
rubies in North Carolina, sapphires in Montana, emeralds in the Caro- 
linas, beryl in Maine, quartz gems iu Pennsylvania, North Carolina, 
California, Wyoming, and Arizona, and utahlite, opal, and hyalite from 
Utah. 
L. 
280 Lakes (A.). Fossilized big trees, California. 
Sci. Am. Suppl., vol. xxxix, p. 15862. 
Describes the occurrence of fossil trees in Cretaceous and Tertiary 
strata of California. 
281 Lane (Alfred 0.). A connection between the chemical and optical 
properties of amphiboles. 
Abstract : Geol. Soc. Am., Bull., vol. vi, p. 3 (I p.). 
Gives brief statement of the law which seems to apply to all horn- 
blendes. 
282 Crystallized slags from copper smelting. 
Abstract: Geol. Soc. Am., Bull., vol. vi, pp. 469-470. 
Describes crystals of melilite occurring in these slags. 
283 The bowels of the earth. 
Pop. Sci. Monthly, vol. xlvii, pp. 302-313. 
Comprises a discussion of the phenomena of volcanoes and earthquakes 
and of the condition of the earth's interior. 
284 Laur (Frank). The bauxites: A study of a new mineralogical 
family. 
Am. Inst. Mg. Engrs., Trans., vol. xxiv, pp. 234-242. 
Discusses the mineralogic and chemical characters of bauxite. 
